package com.ly.web.controller.common;

import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.concurrent.TimeUnit;
import javax.annotation.Resource;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletResponse;

import com.ly.common.constant.Constants;
import com.ly.common.core.domain.AjaxResult;
import com.ly.common.core.redis.RedisCache;
import com.ly.common.utils.sign.Base64;
import com.ly.common.utils.uuid.IdUtils;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.util.FastByteArrayOutputStream;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import com.google.code.kaptcha.Producer;

/**
 * 验证码操作处理
 * @author
 */
@RestController
@CrossOrigin(value = "*", maxAge = 3600)
public class CaptchaController {

    @Resource (name = "captchaProducer")
    private Producer captchaProducer;

    @Resource (name = "captchaProducerMath")
    private Producer captchaProducerMath;

    @Resource
    private RedisCache redisCache;

    // 验证码类型
    @Value ("${erp.captchaType}")
    private String captchaType;

    /**
     * 生成验证码
     */
    @GetMapping ("/captchaImage")
    public AjaxResult getCode (HttpServletResponse response) throws IOException {
        // 保存验证码信息
        String uuid = IdUtils.simpleUUID ();
        String verifyKey = Constants.CAPTCHA_CODE_KEY + uuid;

        String capStr = null, code = null;
        BufferedImage image = null;

        // 生成验证码
        if ( "math".equals ( captchaType ) ) {
            String capText = captchaProducerMath.createText ();
            capStr = capText.substring ( 0, capText.lastIndexOf ( "@" ) );
            code = capText.substring ( capText.lastIndexOf ( "@" ) + 1 );
            image = captchaProducerMath.createImage ( capStr );
        } else if ( "char".equals ( captchaType ) ) {
            capStr = code = captchaProducer.createText ();
            image = captchaProducer.createImage ( capStr );
        }

        redisCache.setCacheObject ( verifyKey, code, Constants.CAPTCHA_EXPIRATION, TimeUnit.MINUTES );
        // 转换流信息写出
        FastByteArrayOutputStream os = new FastByteArrayOutputStream ();
        try {
            ImageIO.write ( image, "jpg", os );
        } catch ( IOException e ) {
            return AjaxResult.error ( e.getMessage () );
        }

        AjaxResult ajax = AjaxResult.success ();
        ajax.put ( "uuid", uuid );
        ajax.put ( "img", Base64.encode ( os.toByteArray () ) );
        return ajax;
    }
}
